Made of high speed steel, this interchangeable pilot counterbore features a four flute cutting head, and 1/4" straight shank. Designed to enlarge an existing hole for hiding a screw head or seating a nut. Must be used with 1/8" shank counterbore pilot (sold separately). Four flute interchangeable pilot counterbore, high speed steel
Straight shank 1/4"
Size 9/16", hole diameter 1/8", overall length 2 13/16"
Must be used with 1/8" shank counterbore pilot, not included